In 3D graphics, a technique developed by Phong Bui-Tuong in the mid-1970s that computes a shaded surface based on the color and illumination at each pixel. Phong shading is more realistic than Gouraud shading, but requires more computation. It does not produce shadows or reflections. The surface normals at the triangle's points are used to compute a surface normal for each pixel, which in turn creates a more accurate RGB value for each pixel. See flat shading and Gouraud shading.